By Jailene Cuevas Prince Harry could be regretting some of the things he wrote in his memoir about the Princess of Wales. The Duke of Sussex and Princess Kate shared a close bond before Harry and his wife, Meghan Markle, left their royal duties and exposed private information on the family in interviews, their Netflix documentary, and in Harry’s memoir, Spare. A royal expert came forward and said that Harry could be in a “painful place” after he had written about Kate in his memoir and was now recently diagnosed with cancer. “When you do discover that your sister-in-law has cancer and you’ve w…